Chinese Premier Wen Jiabao said Saturday that the international standoff over Iran's disputed nuclear program must be resolved peacefully and he cautioned against the imposition of sanctions. Wen stressed his country doesn't want Iran to develop nuclear weapons and would "make tireless efforts" for a negotiated solution."That said, diplomatic efforts will be a long process," he told reporters on the sidelines of a summit with the European Union. "To mount pressure or impose sanctions will not necessarily bring about a peaceful solution." His comments came as EU foreign policy chief Javier Solana met with Iranian nuclear negotiator Ali Larijani in Vienna, Austria, about Tehran's defiance of international demands that it give up uranium enrichment.